G - Physics – 03 – B
Patent
G - Physics
03
B
95/53.7
G03B 7/08 (2006.01) G03B 7/081 (2006.01) G03B 7/16 (2006.01)
Patent
CA 1105757
5766 ABSTRACT OF THE DISCLOSURE An exposure control for a camera of the type having scanning type shutter blade elements driven by a walking beam to provide a progressive variation in effect- ive exposure and light sensing apertures. A control is provided so that in an artificial scene lighted mode, during an exposure cycle, the scanning blades cause the effective exposure aperture to progressively increase toward the full open f/stop for the camera. In addition, the scanning blades cause the effective photocell aperture to increase at a relatively low rate until a time when the effective exposure aperture equals a predetermined f/stop somewhat below the full open f/stop. The source of artificial illumination is then fired and the effective photocell aperture increases at a relatively high rate to specifically control the artificially illuminated portion of the exposure cycle. In a natural or ambient scene lighted mode, the control provides for the scanning shutter blades to cause both the effective exposure aperture and the effective photocell aperture to progressively increase to predetermined aperture sizes less than the maximum aperture sizes of the artificial scene lighted mode.
304424
Johnson Bruce K.
Whiteside George D.
Polaroid Corporation
Smart & Biggar
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